source3/libsmb/clidfs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client connect/disconnect routines
   4    Copyright (C) Andrew Tridgell                  1994-1998
   5    Copyright (C) Gerald (Jerry) Carter            2004
   6    Copyright (C) Jeremy Allison                   2007
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 /********************************************************************
  25  Important point.
  26
  27  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  28  are not C escaped here).
  29
  30  - but if we're using POSIX paths then <pathname> may contain
  31    '/' separators, not '\\' separators. So cope with '\\' or '/'
  32    as a separator when looking at the pathname part.... JRA.
  33 ********************************************************************/
  34
  35 struct client_connection {
  36         struct client_connection *prev, *next;
  37         struct cli_state *cli;
  38         char *mount;
  39 };
  40
  41 static struct cm_cred_struct {
  42         char *username;
  43         char *password;
  44         bool got_pass;
  45         bool use_kerberos;
  46         bool fallback_after_kerberos;
  47         int signing_state;
  48 } cm_creds;
  49
  50 static void cm_set_password(const char *newpass);
  51
  52 static struct client_connection *connections;
  53
  54 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
  55                                 struct cli_state *cli,
  56                                 const char *sharename,
  57                                 char **pp_newserver,
  58                                 char **pp_newshare,
  59                                 bool force_encrypt,
  60                                 const char *username,
  61                                 const char *password,
  62                                 const char *domain);
  63
  64 /********************************************************************
  65  Ensure a connection is encrypted.
  66 ********************************************************************/
  67
  68 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  69                         const char *username,
  70                         const char *password,
  71                         const char *domain,
  72                         const char *sharename)
  73 {
  74         NTSTATUS status = cli_force_encryption(c,
  75                                         username,
  76                                         password,
  77                                         domain);
  78
  79         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  80                 d_printf("Encryption required and "
  81                         "server that doesn't support "
  82                         "UNIX extensions - failing connect\n");
  83         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  84                 d_printf("Encryption required and "
  85                         "can't get UNIX CIFS extensions "
  86                         "version from server.\n");
  87         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  88                 d_printf("Encryption required and "
  89                         "share %s doesn't support "
  90                         "encryption.\n", sharename);
  91         } else if (!NT_STATUS_IS_OK(status)) {
  92                 d_printf("Encryption required and "
  93                         "setup failed with error %s.\n",
  94                         nt_errstr(status));
  95         }
  96
  97         return status;
  98 }
  99
 100 /********************************************************************
 101  Return a connection to a server.
 102 ********************************************************************/
 103
 104 static struct cli_state *do_connect(TALLOC_CTX *ctx,
 105                                         const char *server,
 106                                         const char *share,
 107                                         bool show_sessetup,
 108                                         bool force_encrypt,
 109                                         int max_protocol,
 110                                         int port,
 111                                         int name_type)
 112 {
 113         struct cli_state *c = NULL;
 114         struct nmb_name called, calling;
 115         const char *server_n;
 116         struct sockaddr_storage ss;
 117         char *servicename;
 118         char *sharename;
 119         char *newserver, *newshare;
 120         const char *username;
 121         const char *password;
 122         NTSTATUS status;
 123
 124         /* make a copy so we don't modify the global string 'service' */
 125         servicename = talloc_strdup(ctx,share);
 126         if (!servicename) {
 127                 return NULL;
 128         }
 129         sharename = servicename;
 130         if (*sharename == '\\') {
 131                 sharename += 2;
 132                 if (server == NULL) {
 133                         server = sharename;
 134                 }
 135                 sharename = strchr_m(sharename,'\\');
 136                 if (!sharename) {
 137                         return NULL;
 138                 }
 139                 *sharename = 0;
 140                 sharename++;
 141         }
 142
 143         server_n = server;
 144
 145         zero_sockaddr(&ss);
 146
 147         make_nmb_name(&calling, global_myname(), 0x0);
 148         make_nmb_name(&called , server, name_type);
 149
 150  again:
 151         zero_sockaddr(&ss);
 152
 153         /* have to open a new connection */
 154         if (!(c=cli_initialise())) {
 155                 d_printf("Connection to %s failed\n", server_n);
 156                 if (c) {
 157                         cli_shutdown(c);
 158                 }
 159                 return NULL;
 160         }
 161         if (port) {
 162                 cli_set_port(c, port);
 163         }
 164
 165         status = cli_connect(c, server_n, &ss);
 166         if (!NT_STATUS_IS_OK(status)) {
 167                 d_printf("Connection to %s failed (Error %s)\n",
 168                                 server_n,
 169                                 nt_errstr(status));
 170                 cli_shutdown(c);
 171                 return NULL;
 172         }
 173
 174         if (max_protocol == 0) {
 175                 max_protocol = PROTOCOL_NT1;
 176         }
 177         c->protocol = max_protocol;
 178         c->use_kerberos = cm_creds.use_kerberos;
 179         c->fallback_after_kerberos = cm_creds.fallback_after_kerberos;
 180         cli_setup_signing_state(c, cm_creds.signing_state);
 181
 182         if (!cli_session_request(c, &calling, &called)) {
 183                 char *p;
 184                 d_printf("session request to %s failed (%s)\n",
 185                          called.name, cli_errstr(c));
 186                 cli_shutdown(c);
 187                 c = NULL;
 188                 if ((p=strchr_m(called.name, '.'))) {
 189                         *p = 0;
 190                         goto again;
 191                 }
 192                 if (strcmp(called.name, "*SMBSERVER")) {
 193                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 194                         goto again;
 195                 }
 196                 return NULL;
 197         }
 198
 199         DEBUG(4,(" session request ok\n"));
 200
 201         status = cli_negprot(c);
 202
 203         if (!NT_STATUS_IS_OK(status)) {
 204                 d_printf("protocol negotiation failed: %s\n",
 205                          nt_errstr(status));
 206                 cli_shutdown(c);
 207                 return NULL;
 208         }
 209
 210         if (!cm_creds.got_pass && !cm_creds.use_kerberos) {
 211                 char *label = NULL;
 212                 char *pass;
 213                 label = talloc_asprintf(ctx, "Enter %s's password: ",
 214                         cm_creds.username);
 215                 pass = getpass(label);
 216                 if (pass) {
 217                         cm_set_password(pass);
 218                 }
 219                 TALLOC_FREE(label);
 220         }
 221
 222         username = cm_creds.username ? cm_creds.username : "";
 223         password = cm_creds.password ? cm_creds.password : "";
 224
 225         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 226                                                password, strlen(password),
 227                                                password, strlen(password),
 228                                                lp_workgroup()))) {
 229                 /* If a password was not supplied then
 230                  * try again with a null username. */
 231                 if (password[0] || !username[0] || cm_creds.use_kerberos ||
 232                     !NT_STATUS_IS_OK(cli_session_setup(c, "",
 233                                                 "", 0,
 234                                                 "", 0,
 235                                                lp_workgroup()))) {
 236                         d_printf("session setup failed: %s\n", cli_errstr(c));
 237                         if (NT_STATUS_V(cli_nt_error(c)) ==
 238                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 239                                 d_printf("did you forget to run kinit?\n");
 240                         cli_shutdown(c);
 241                         return NULL;
 242                 }
 243                 d_printf("Anonymous login successful\n");
 244         }
 245
 246         if ( show_sessetup ) {
 247                 if (*c->server_domain) {
 248                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 249                                 c->server_domain,c->server_os,c->server_type));
 250                 } else if (*c->server_os || *c->server_type) {
 251                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 252                                  c->server_os,c->server_type));
 253                 }
 254         }
 255         DEBUG(4,(" session setup ok\n"));
 256
 257         /* here's the fun part....to support 'msdfs proxy' shares
 258            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 259            here before trying to connect to the original share.
 260            check_dfs_proxy() will fail if it is a normal share. */
 261
 262         if ((c->capabilities & CAP_DFS) &&
 263                         cli_check_msdfs_proxy(ctx, c, sharename,
 264                                 &newserver, &newshare,
 265                                 force_encrypt,
 266                                 username,
 267                                 password,
 268                                 lp_workgroup())) {
 269                 cli_shutdown(c);
 270                 return do_connect(ctx, newserver,
 271                                 newshare, false,
 272                                 force_encrypt, max_protocol,
 273                                 port, name_type);
 274         }
 275
 276         /* must be a normal share */
 277
 278         if (!cli_send_tconX(c, sharename, "?????",
 279                                 password, strlen(password)+1)) {
 280                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 281                 cli_shutdown(c);
 282                 return NULL;
 283         }
 284
 285         if (force_encrypt) {
 286                 status = cli_cm_force_encryption(c,
 287                                         username,
 288                                         password,
 289                                         lp_workgroup(),
 290                                         sharename);
 291                 if (!NT_STATUS_IS_OK(status)) {
 292                         cli_shutdown(c);
 293                         return NULL;
 294                 }
 295         }
 296
 297         DEBUG(4,(" tconx ok\n"));
 298         return c;
 299 }
 300
 301 /****************************************************************************
 302 ****************************************************************************/
 303
 304 static void cli_cm_set_mntpoint(struct cli_state *c, const char *mnt)
 305 {
 306         struct client_connection *p;
 307         int i;
 308
 309         for (p=connections,i=0; p; p=p->next,i++) {
 310                 if (strequal(p->cli->desthost, c->desthost) &&
 311                                 strequal(p->cli->share, c->share)) {
 312                         break;
 313                 }
 314         }
 315
 316         if (p) {
 317                 char *name = clean_name(NULL, mnt);
 318                 if (!name) {
 319                         return;
 320                 }
 321                 TALLOC_FREE(p->mount);
 322                 p->mount = talloc_strdup(p, name);
 323                 TALLOC_FREE(name);
 324         }
 325 }
 326
 327 /****************************************************************************
 328 ****************************************************************************/
 329
 330 const char *cli_cm_get_mntpoint(struct cli_state *c)
 331 {
 332         struct client_connection *p;
 333         int i;
 334
 335         for (p=connections,i=0; p; p=p->next,i++) {
 336                 if (strequal(p->cli->desthost, c->desthost) &&
 337                                 strequal(p->cli->share, c->share)) {
 338                         break;
 339                 }
 340         }
 341
 342         if (p) {
 343                 return p->mount;
 344         }
 345         return NULL;
 346 }
 347
 348 /********************************************************************
 349  Add a new connection to the list
 350 ********************************************************************/
 351
 352 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 353                                         struct cli_state *referring_cli,
 354                                         const char *server,
 355                                         const char *share,
 356                                         bool show_hdr,
 357                                         bool force_encrypt,
 358                                         int max_protocol,
 359                                         int port,
 360                                         int name_type)
 361 {
 362         struct client_connection *node;
 363
 364         /* NB This must be the null context here... JRA. */
 365         node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1);
 366         if (!node) {
 367                 return NULL;
 368         }
 369
 370         node->cli = do_connect(ctx, server, share,
 371                                 show_hdr, force_encrypt, max_protocol,
 372                                 port, name_type);
 373
 374         if ( !node->cli ) {
 375                 TALLOC_FREE( node );
 376                 return NULL;
 377         }
 378
 379         DLIST_ADD( connections, node );
 380
 381         cli_cm_set_mntpoint(node->cli, "");
 382
 383         if (referring_cli && referring_cli->posix_capabilities) {
 384                 uint16 major, minor;
 385                 uint32 caplow, caphigh;
 386                 if (cli_unix_extensions_version(node->cli, &major,
 387                                         &minor, &caplow, &caphigh)) {
 388                         cli_set_unix_extensions_capabilities(node->cli,
 389                                         major, minor,
 390                                         caplow, caphigh);
 391                 }
 392         }
 393
 394         return node->cli;
 395 }
 396
 397 /********************************************************************
 398  Return a connection to a server.
 399 ********************************************************************/
 400
 401 static struct cli_state *cli_cm_find(const char *server, const char *share)
 402 {
 403         struct client_connection *p;
 404
 405         for (p=connections; p; p=p->next) {
 406                 if ( strequal(server, p->cli->desthost) &&
 407                                 strequal(share,p->cli->share)) {
 408                         return p->cli;
 409                 }
 410         }
 411
 412         return NULL;
 413 }
 414
 415 /****************************************************************************
 416  Open a client connection to a \\server\share.  Set's the current *cli
 417  global variable as a side-effect (but only if the connection is successful).
 418 ****************************************************************************/
 419
 420 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 421                                 struct cli_state *referring_cli,
 422                                 const char *server,
 423                                 const char *share,
 424                                 bool show_hdr,
 425                                 bool force_encrypt,
 426                                 int max_protocol,
 427                                 int port,
 428                                 int name_type)
 429 {
 430         struct cli_state *c;
 431
 432         /* try to reuse an existing connection */
 433
 434         c = cli_cm_find(server, share);
 435         if (!c) {
 436                 c = cli_cm_connect(ctx, referring_cli,
 437                                 server, share, show_hdr, force_encrypt,
 438                                 max_protocol, port, name_type);
 439         }
 440
 441         return c;
 442 }
 443
 444 /****************************************************************************
 445 ****************************************************************************/
 446
 447 void cli_cm_shutdown(void)
 448 {
 449         struct client_connection *p, *x;
 450
 451         for (p=connections; p;) {
 452                 cli_shutdown(p->cli);
 453                 x = p;
 454                 p = p->next;
 455
 456                 TALLOC_FREE(x);
 457         }
 458
 459         connections = NULL;
 460         return;
 461 }
 462
 463 /****************************************************************************
 464 ****************************************************************************/
 465
 466 void cli_cm_display(void)
 467 {
 468         struct client_connection *p;
 469         int i;
 470
 471         for ( p=connections,i=0; p; p=p->next,i++ ) {
 472                 d_printf("%d:\tserver=%s, share=%s\n",
 473                         i, p->cli->desthost, p->cli->share );
 474         }
 475 }
 476
 477 /****************************************************************************
 478 ****************************************************************************/
 479
 480 static void cm_set_password(const char *newpass)
 481 {
 482         SAFE_FREE(cm_creds.password);
 483         cm_creds.password = SMB_STRDUP(newpass);
 484         if (cm_creds.password) {
 485                 cm_creds.got_pass = true;
 486         }
 487 }
 488
 489 /****************************************************************************
 490 ****************************************************************************/
 491
 492 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 493 {
 494         SAFE_FREE(cm_creds.username);
 495         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 496                                                auth_info));
 497
 498         if (get_cmdline_auth_info_got_pass(auth_info)) {
 499                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 500         }
 501
 502         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 503         cm_creds.fallback_after_kerberos = false;
 504         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 505 }
 506
 507 /****************************************************************************
 508 ****************************************************************************/
 509
 510 void cli_cm_set_signing_state(int state)
 511 {
 512         cm_creds.signing_state = state;
 513 }
 514
 515 /****************************************************************************
 516 ****************************************************************************/
 517
 518 void cli_cm_set_username(const char *username)
 519 {
 520         SAFE_FREE(cm_creds.username);
 521         cm_creds.username = SMB_STRDUP(username);
 522 }
 523
 524 /****************************************************************************
 525 ****************************************************************************/
 526
 527 void cli_cm_set_password(const char *newpass)
 528 {
 529         SAFE_FREE(cm_creds.password);
 530         cm_creds.password = SMB_STRDUP(newpass);
 531         if (cm_creds.password) {
 532                 cm_creds.got_pass = true;
 533         }
 534 }
 535
 536 /****************************************************************************
 537 ****************************************************************************/
 538
 539 void cli_cm_set_use_kerberos(void)
 540 {
 541         cm_creds.use_kerberos = true;
 542 }
 543
 544 /****************************************************************************
 545 ****************************************************************************/
 546
 547 void cli_cm_set_fallback_after_kerberos(void)
 548 {
 549         cm_creds.fallback_after_kerberos = true;
 550 }
 551
 552 /**********************************************************************
 553  split a dfs path into the server, share name, and extrapath components
 554 **********************************************************************/
 555
 556 static void split_dfs_path(TALLOC_CTX *ctx,
 557                                 const char *nodepath,
 558                                 char **pp_server,
 559                                 char **pp_share,
 560                                 char **pp_extrapath)
 561 {
 562         char *p, *q;
 563         char *path;
 564
 565         *pp_server = NULL;
 566         *pp_share = NULL;
 567         *pp_extrapath = NULL;
 568
 569         path = talloc_strdup(ctx, nodepath);
 570         if (!path) {
 571                 return;
 572         }
 573
 574         if ( path[0] != '\\' ) {
 575                 return;
 576         }
 577
 578         p = strchr_m( path + 1, '\\' );
 579         if ( !p ) {
 580                 return;
 581         }
 582
 583         *p = '\0';
 584         p++;
 585
 586         /* Look for any extra/deep path */
 587         q = strchr_m(p, '\\');
 588         if (q != NULL) {
 589                 *q = '\0';
 590                 q++;
 591                 *pp_extrapath = talloc_strdup(ctx, q);
 592         } else {
 593                 *pp_extrapath = talloc_strdup(ctx, "");
 594         }
 595
 596         *pp_share = talloc_strdup(ctx, p);
 597         *pp_server = talloc_strdup(ctx, &path[1]);
 598 }
 599
 600 /****************************************************************************
 601  Return the original path truncated at the directory component before
 602  the first wildcard character. Trust the caller to provide a NULL
 603  terminated string
 604 ****************************************************************************/
 605
 606 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 607 {
 608         size_t len;
 609         char *p1, *p2, *p;
 610         char *path_out;
 611
 612         /* No absolute paths. */
 613         while (IS_DIRECTORY_SEP(*path)) {
 614                 path++;
 615         }
 616
 617         path_out = talloc_strdup(ctx, path);
 618         if (!path_out) {
 619                 return NULL;
 620         }
 621
 622         p1 = strchr_m(path_out, '*');
 623         p2 = strchr_m(path_out, '?');
 624
 625         if (p1 || p2) {
 626                 if (p1 && p2) {
 627                         p = MIN(p1,p2);
 628                 } else if (!p1) {
 629                         p = p2;
 630                 } else {
 631                         p = p1;
 632                 }
 633                 *p = '\0';
 634
 635                 /* Now go back to the start of this component. */
 636                 p1 = strrchr_m(path_out, '/');
 637                 p2 = strrchr_m(path_out, '\\');
 638                 p = MAX(p1,p2);
 639                 if (p) {
 640                         *p = '\0';
 641                 }
 642         }
 643
 644         /* Strip any trailing separator */
 645
 646         len = strlen(path_out);
 647         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 648                 path_out[len-1] = '\0';
 649         }
 650
 651         return path_out;
 652 }
 653
 654 /****************************************************************************
 655 ****************************************************************************/
 656
 657 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 658                                         struct cli_state *cli,
 659                                         const char *dir)
 660 {
 661         /* Ensure the extrapath doesn't start with a separator. */
 662         while (IS_DIRECTORY_SEP(*dir)) {
 663                 dir++;
 664         }
 665
 666         return talloc_asprintf(ctx, "\\%s\\%s\\%s",
 667                         cli->desthost, cli->share, dir);
 668 }
 669
 670 /********************************************************************
 671  check for dfs referral
 672 ********************************************************************/
 673
 674 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 675 {
 676         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 677
 678         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 679
 680         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 681                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 682                 return false;
 683
 684         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 685                 return true;
 686
 687         return false;
 688 }
 689
 690 /********************************************************************
 691  Get the dfs referral link.
 692 ********************************************************************/
 693
 694 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 695                         struct cli_state *cli,
 696                         const char *path,
 697                         CLIENT_DFS_REFERRAL**refs,
 698                         size_t *num_refs,
 699                         uint16 *consumed)
 700 {
 701         unsigned int data_len = 0;
 702         unsigned int param_len = 0;
 703         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 704         char *param;
 705         char *rparam=NULL, *rdata=NULL;
 706         char *p;
 707         char *endp;
 708         size_t pathlen = 2*(strlen(path)+1);
 709         uint16 num_referrals;
 710         CLIENT_DFS_REFERRAL *referrals = NULL;
 711         bool ret = false;
 712
 713         *num_refs = 0;
 714         *refs = NULL;
 715
 716         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 717         if (!param) {
 718                 return false;
 719         }
 720         SSVAL(param, 0, 0x03);  /* max referral level */
 721         p = &param[2];
 722
 723         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 724         param_len = PTR_DIFF(p, param);
 725
 726         if (!cli_send_trans(cli, SMBtrans2,
 727                         NULL,                        /* name */
 728                         -1, 0,                          /* fid, flags */
 729                         &setup, 1, 0,                   /* setup, length, max */
 730                         param, param_len, 2,            /* param, length, max */
 731                         NULL, 0, cli->max_xmit /* data, length, max */
 732                         )) {
 733                 SAFE_FREE(param);
 734                 return false;
 735         }
 736
 737         SAFE_FREE(param);
 738
 739         if (!cli_receive_trans(cli, SMBtrans2,
 740                 &rparam, &param_len,
 741                 &rdata, &data_len)) {
 742                         return false;
 743         }
 744
 745         if (data_len < 4) {
 746                 goto out;
 747         }
 748
 749         endp = rdata + data_len;
 750
 751         *consumed     = SVAL(rdata, 0);
 752         num_referrals = SVAL(rdata, 2);
 753
 754         if (num_referrals != 0) {
 755                 uint16 ref_version;
 756                 uint16 ref_size;
 757                 int i;
 758                 uint16 node_offset;
 759
 760                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
 761                                 num_referrals);
 762
 763                 if (!referrals) {
 764                         goto out;
 765                 }
 766                 /* start at the referrals array */
 767
 768                 p = rdata+8;
 769                 for (i=0; i<num_referrals && p < endp; i++) {
 770                         if (p + 18 > endp) {
 771                                 goto out;
 772                         }
 773                         ref_version = SVAL(p, 0);
 774                         ref_size    = SVAL(p, 2);
 775                         node_offset = SVAL(p, 16);
 776
 777                         if (ref_version != 3) {
 778                                 p += ref_size;
 779                                 continue;
 780                         }
 781
 782                         referrals[i].proximity = SVAL(p, 8);
 783                         referrals[i].ttl       = SVAL(p, 10);
 784
 785                         if (p + node_offset > endp) {
 786                                 goto out;
 787                         }
 788                         clistr_pull_talloc(ctx, cli->inbuf,
 789                                            &referrals[i].dfspath,
 790                                            p+node_offset, -1,
 791                                            STR_TERMINATE|STR_UNICODE);
 792
 793                         if (!referrals[i].dfspath) {
 794                                 goto out;
 795                         }
 796                         p += ref_size;
 797                 }
 798                 if (i < num_referrals) {
 799                         goto out;
 800                 }
 801         }
 802
 803         ret = true;
 804
 805         *num_refs = num_referrals;
 806         *refs = referrals;
 807
 808   out:
 809
 810         SAFE_FREE(rdata);
 811         SAFE_FREE(rparam);
 812         return ret;
 813 }
 814
 815 /********************************************************************
 816 ********************************************************************/
 817
 818 bool cli_resolve_path(TALLOC_CTX *ctx,
 819                         const char *mountpt,
 820                         struct cli_state *rootcli,
 821                         const char *path,
 822                         struct cli_state **targetcli,
 823                         char **pp_targetpath)
 824 {
 825         CLIENT_DFS_REFERRAL *refs = NULL;
 826         size_t num_refs = 0;
 827         uint16 consumed;
 828         struct cli_state *cli_ipc = NULL;
 829         char *dfs_path = NULL;
 830         char *cleanpath = NULL;
 831         char *extrapath = NULL;
 832         int pathlen;
 833         char *server = NULL;
 834         char *share = NULL;
 835         struct cli_state *newcli = NULL;
 836         char *newpath = NULL;
 837         char *newmount = NULL;
 838         char *ppath = NULL;
 839         SMB_STRUCT_STAT sbuf;
 840         uint32 attributes;
 841
 842         if ( !rootcli || !path || !targetcli ) {
 843                 return false;
 844         }
 845
 846         /* Don't do anything if this is not a DFS root. */
 847
 848         if ( !rootcli->dfsroot) {
 849                 *targetcli = rootcli;
 850                 *pp_targetpath = talloc_strdup(ctx, path);
 851                 if (!*pp_targetpath) {
 852                         return false;
 853                 }
 854                 return true;
 855         }
 856
 857         *targetcli = NULL;
 858
 859         /* Send a trans2_query_path_info to check for a referral. */
 860
 861         cleanpath = clean_path(ctx, path);
 862         if (!cleanpath) {
 863                 return false;
 864         }
 865
 866         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 867         if (!dfs_path) {
 868                 return false;
 869         }
 870
 871         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 872                 /* This is an ordinary path, just return it. */
 873                 *targetcli = rootcli;
 874                 *pp_targetpath = talloc_strdup(ctx, path);
 875                 if (!*pp_targetpath) {
 876                         return false;
 877                 }
 878                 goto done;
 879         }
 880
 881         /* Special case where client asked for a path that does not exist */
 882
 883         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 884                 *targetcli = rootcli;
 885                 *pp_targetpath = talloc_strdup(ctx, path);
 886                 if (!*pp_targetpath) {
 887                         return false;
 888                 }
 889                 goto done;
 890         }
 891
 892         /* We got an error, check for DFS referral. */
 893
 894         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 895                 return false;
 896         }
 897
 898         /* Check for the referral. */
 899
 900         if (!(cli_ipc = cli_cm_open(ctx, rootcli,
 901                                         rootcli->desthost,
 902                                         "IPC$", false,
 903                                         (rootcli->trans_enc_state != NULL),
 904                                         rootcli->protocol,
 905                                         0,
 906                                         0x20))) {
 907                 return false;
 908         }
 909
 910         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 911                         &num_refs, &consumed) || !num_refs) {
 912                 return false;
 913         }
 914
 915         /* Just store the first referral for now. */
 916
 917         if (!refs[0].dfspath) {
 918                 return false;
 919         }
 920         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 921
 922         if (!server || !share) {
 923                 return false;
 924         }
 925
 926         /* Make sure to recreate the original string including any wildcards. */
 927
 928         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 929         if (!dfs_path) {
 930                 return false;
 931         }
 932         pathlen = strlen(dfs_path)*2;
 933         consumed = MIN(pathlen, consumed);
 934         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 935         if (!*pp_targetpath) {
 936                 return false;
 937         }
 938         dfs_path[consumed/2] = '\0';
 939
 940         /*
 941          * *pp_targetpath is now the unconsumed part of the path.
 942          * dfs_path is now the consumed part of the path
 943          * (in \server\share\path format).
 944          */
 945
 946         /* Open the connection to the target server & share */
 947         if ((*targetcli = cli_cm_open(ctx, rootcli,
 948                                         server,
 949                                         share,
 950                                         false,
 951                                         (rootcli->trans_enc_state != NULL),
 952                                         rootcli->protocol,
 953                                         0,
 954                                         0x20)) == NULL) {
 955                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 956                         server, share );
 957                 return false;
 958         }
 959
 960         if (extrapath && strlen(extrapath) > 0) {
 961                 *pp_targetpath = talloc_asprintf(ctx,
 962                                                 "%s%s",
 963                                                 extrapath,
 964                                                 *pp_targetpath);
 965                 if (!*pp_targetpath) {
 966                         return false;
 967                 }
 968         }
 969
 970         /* parse out the consumed mount path */
 971         /* trim off the \server\share\ */
 972
 973         ppath = dfs_path;
 974
 975         if (*ppath != '\\') {
 976                 d_printf("cli_resolve_path: "
 977                         "dfs_path (%s) not in correct format.\n",
 978                         dfs_path );
 979                 return false;
 980         }
 981
 982         ppath++; /* Now pointing at start of server name. */
 983
 984         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 985                 return false;
 986         }
 987
 988         ppath++; /* Now pointing at start of share name. */
 989
 990         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 991                 return false;
 992         }
 993
 994         ppath++; /* Now pointing at path component. */
 995
 996         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 997         if (!newmount) {
 998                 return false;
 999         }
1000
1001         cli_cm_set_mntpoint(*targetcli, newmount);
1002
1003         /* Check for another dfs referral, note that we are not
1004            checking for loops here. */
1005
1006         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1007                 if (cli_resolve_path(ctx,
1008                                         newmount,
1009                                         *targetcli,
1010                                         *pp_targetpath,
1011                                         &newcli,
1012                                         &newpath)) {
1013                         /*
1014                          * When cli_resolve_path returns true here it's always
1015                          * returning the complete path in newpath, so we're done
1016                          * here.
1017                          */
1018                         *targetcli = newcli;
1019                         *pp_targetpath = newpath;
1020                         return true;
1021                 }
1022         }
1023
1024   done:
1025
1026         /* If returning true ensure we return a dfs root full path. */
1027         if ((*targetcli)->dfsroot) {
1028                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1029                 if (!dfs_path) {
1030                         return false;
1031                 }
1032                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1033         }
1034
1035         return true;
1036 }
1037
1038 /********************************************************************
1039 ********************************************************************/
1040
1041 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1042                                 struct cli_state *cli,
1043                                 const char *sharename,
1044                                 char **pp_newserver,
1045                                 char **pp_newshare,
1046                                 bool force_encrypt,
1047                                 const char *username,
1048                                 const char *password,
1049                                 const char *domain)
1050 {
1051         CLIENT_DFS_REFERRAL *refs = NULL;
1052         size_t num_refs = 0;
1053         uint16 consumed;
1054         char *fullpath = NULL;
1055         bool res;
1056         uint16 cnum;
1057         char *newextrapath = NULL;
1058
1059         if (!cli || !sharename) {
1060                 return false;
1061         }
1062
1063         cnum = cli->cnum;
1064
1065         /* special case.  never check for a referral on the IPC$ share */
1066
1067         if (strequal(sharename, "IPC$")) {
1068                 return false;
1069         }
1070
1071         /* send a trans2_query_path_info to check for a referral */
1072
1073         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1074         if (!fullpath) {
1075                 return false;
1076         }
1077
1078         /* check for the referral */
1079
1080         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
1081                 return false;
1082         }
1083
1084         if (force_encrypt) {
1085                 NTSTATUS status = cli_cm_force_encryption(cli,
1086                                         username,
1087                                         password,
1088                                         lp_workgroup(),
1089                                         "IPC$");
1090                 if (!NT_STATUS_IS_OK(status)) {
1091                         return false;
1092                 }
1093         }
1094
1095         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1096
1097         if (!cli_tdis(cli)) {
1098                 return false;
1099         }
1100
1101         cli->cnum = cnum;
1102
1103         if (!res || !num_refs) {
1104                 return false;
1105         }
1106
1107         if (!refs[0].dfspath) {
1108                 return false;
1109         }
1110
1111         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1112                         pp_newshare, &newextrapath );
1113
1114         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1115                 return false;
1116         }
1117
1118         /* check that this is not a self-referral */
1119
1120         if (strequal(cli->desthost, *pp_newserver) &&
1121                         strequal(sharename, *pp_newshare)) {
1122                 return false;
1123         }
1124
1125         return true;
1126 }